Digital BW, The Print

I'm having a hell of a time getting decent prints with a new C88 and the MIS EZ inks.

I've been all thru Paul's settings documents several times and tried all kinds of variations, but 
I'm just not getting very good prints.  Not good at all.

So my question is:  with the 4 ink set from MIS, do I print in "color" or do I do "Black"?  Black 
seems to be much better, but then why would they sell me four inks if the quality is so poor 
printing with them?

I've tried reams of different paper:  EEM, Kirkland (from MIS), Canon Glossy, Epson Glossy, HP 
Glossy, Konica glossy (had a bunch of this on hand), Crane Museo SR and Innova F-type 
Glossy.  The latter two papers look much better, but they should - they are beautiful papers 
and they cost it.  I got this system to proof print stuff using cheap paper and save my 2400 
for final printing.

Comments anyone?